Variable reference signal generating circuit and analog comparat

Details Variable reference signal generating circuit and analog comparat Variable reference signal generating circuit and analog comparat

1977-06-13

1979-06-05

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307354, 307360, 328116, H03K 5153, H03K 520

Patent

active

041575091

ABSTRACT:
A variable reference signal generating circuit concurrently generating a high and a low reference signal and an analogue signal comparator having hysteresis are used to compare an input signal with the high and low reference signals to determine the relative level of the input signal with respect to the limits defined by the high and low reference signals. The signal comparators are switching comparators with hysteresis which switch their outputs between high and low levels in response to the detection of a change in a relative magnitude between the input signal and the reference signals. For an input close to the switching threshold of a comparator, the comparator may maintain an output level indicative of a prior relationship between the input signal and the reference signal while the input signal has actually changed to a magnitude which should be represented by a change in the comparator output level. This error is a result of the hysteresis loop defining the operation of the comparator near its threshold level whereby the output of the comparator may be on the incorrect side of the hysteresis loop to maintain an incorrect output. To correct the comparator output signal from such an erroneous indication, the reference signal generating circuit is momentarily modified to produce a new pair of high and low reference signals which are displaced above and below the steady state reference signals, respectively. Such a displacement of the reference signal levels will result in a correction of the comparator output signal level since the difference between the input signal and the reference signal is substantially increased beyond the resulting hysteresis loop of the comparator, i.e., the input signal is outside of the modified comparator hysteresis loop which is based on the displaced reference signals.

REFERENCES:
patent: 3416004 (1968-12-01), Taylor
patent: 3813665 (1974-05-01), Parfomak et al.
patent: 4007382 (1977-02-01), Warberg

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